import java.util.Scanner;

public class Demo1 {
    private static volatile int flag = 0;
    public static void main(String[] args) throws InterruptedException {
        Thread t1 = new Thread(() -> {
           while(flag == 0){

           }
            System.out.println("t1结束");
        });
        Thread t2 = new Thread(() -> {
            Scanner scanner = new Scanner(System.in);
            System.out.println("输入");
            flag = scanner.nextInt();
            System.out.println("t2执行了");
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
    }
}
